nanopi R6S / R6C changes

[Michel Lespinasse]

Hi,

I would like to request feedback on my github pull request at
https://github.com/openwrt/openwrt/pull/17638

The intention there is to bring the nanopi R6S and R6C targets more in
line with expectations one has of a generic openwrt device. The volume
of changes is low, this is just:
- device tree changes to configure the system LED and reset button behaviors;
- setting up network IRQ affinity to the fast cores (as was already
  done for the similarly configured nanopi R4S)
- configuring R8169 module to be mentioned in /etc/module-boot.d
  to avoid potential naming races with external hardware.

The changes are against main branch but to be honest, I think it would
be good to have them in 24.10 branch too given their limited scope.

A prior test workflow completed with some errors, which seemed to be
just internal to the test workflow itself (i.e. failures to fetch some
files during the workflow execution). I just sent out a rebase, both
to get rid of an undesired merge I had at the end of the previous
request, and in hopes of getting a clean test workflow run this time :)

Please let me know of any comments,

--
Michel Lespinasse